Thanks for the quick response 
Yes, I already wrote a similar question earlier.
But, this question arose for me because I saw a chat with a chatbot in the sidebar here on Meta. I know that usually a chat with a particular user appears in the sidebar after the users have chatted. But, I had not previously communicated with a chatbot on Meta and therefore thought that now there was a function showing a link to a chat with @Chatbot_bot by default for all users on forum 